> migrate as expected. From Lieber's comments it sounds like the NW coast> groups were facing the same predicament: Even though there was an abundance> of salmon when the salmon ran, not enough salmon could be obtained to carry> them through the lean season when the lean season was bad?>
A paper by Moss in American Anthropologist vol 95 (1993) no. 3, seems
relevant here. She suggests that, for the Tlingit, salmon had vast
importance particularly for 'aristocrats' (her term) but shellfish
were more basic for large parts of the population.

Characterizing Northwest Coast subsistence as 'salmon' is a vast
oversimplification.